https://easa.europa.eu/system/files/...bin%20crew.pdf
Annex to ED Decision 2011/015/R
GM1 MED.B.001 Limitation codes:
OML Valid only as or with qualified co-pilot
This applies to crew members who do not meet the medical requirements for single crew operations, but are fit for multi-crew operations. Applicable to class 1 medical certificates only.
All this means that OML is for commercial OPS only, and you should be fine for your solo, private flights ('I-G' ICAO flight plan).